the obama administration has since reversed that appraisal and now calls it a well coordinated terrorist attack. but questions have mounted over the shifting assessments. and today two republican congressmen, oversight committee chairman darrell issa of california and jays leveled new allegations. in a letter to secretary of state clinton, they charged washington rejected multiple requests for security improvements at been gas emission. they base their assertions on unidentified sources described as multiple u.s. federal government officials. the state department spokeswoman said the secretary would respond in writing this very day. >> her response is going to be relatively succinct today, as i said, expressing her complete commitment to work with the congress to get fully to the bottom of this. but i don't anticipate she'll be able to answer the specific questions today >> warner: the two congressmen say their committee will hold a hearing next wednesday on the libya attack. meanwhile the f.b.i. has sent a team to libya to determine just what happened. and secretary clinton named a revi